The anticorrosive effect of fly ash, slag and a Greek pozzolan in reinforced concrete

Kouloumbi, N.; Batis, G.; Malami, Ch.

doi:10.1016/0958-9465(94)90037-x

Cited by 39 publications

(23 citation statements)

References 5 publications

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“…As stated in the literature [6] pozzolanic cements have a protective effect on corrosion, when chloride ions are present. The gain in durability, as a result of porfiritis inclusion in the mortar, is attributed to its beneficial influence on the concrete permeability, although this is not always obvious in early ages, as well as to the blended cements increased capacity to bind chlorides to their hydration products [7,8].…”

Section: Figurementioning

confidence: 89%

Exploitation of the solid waste of porfiritis in pozzolanic cements

Batis¹,

Pantazopoulou²,

Stavropoulou³

2008

WIT Transactions on Ecology and the Environment

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The objective of this paper is to investigate the possibility of introducing a natural pozzolan named porfiritis, a natural waste product from the gold mines located in N.E. Chalkidiki Greece, as a supplementary cementing material. Blended cement was produced by replacing PC with 20% w/w porfiritis for the evaluation of the pozzolanic cement properties. Reinforced mortar specimens were either partially immersed in 3.5% w/w NaCl solution or exposed to atmospheric conditions, for a period of 6 months. The experimental methods used were: corrosion potential, corrosion rate by the Linear Polarization method, mass loss, carbonation depth and compressive strength. Based on the results of this study, it is concluded that the use of the porfiritic deposit as a blended cement constituent improves the corrosion behaviour of the mortar specimens, while no serious detrimental effect on the mechanical behaviour of the concrete is detected.

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Section: Figurementioning

confidence: 89%

Exploitation of the solid waste of porfiritis in pozzolanic cements

Batis¹,

Pantazopoulou²,

Stavropoulou³

2008

WIT Transactions on Ecology and the Environment

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“…Copper wire cables were connected to the steel bar for electrochemical measurements. Prior to the concrete specimens preparation, the steel rebar surface was cleaned according to the ISO/DIS 8407.3 [5,6]. Thereafter, the rebars were placed axially in cylindrical moulds (Figure 3), where the concrete was cast and stored at ambient conditions in the laboratory for 24 hours.…”

Section: Methodsmentioning

confidence: 99%

Concrete containing thermoplastic waste as aggregates – the effect on the rebars’ corrosion

Gavela¹,

Ntziouni²,

Rakanta³

et al. 2008

WIT Transactions on Ecology and the Environment

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A lot of research has been performed on the utilization of waste products in concrete because it is widely used and has a long service life, which means that the waste is being removed from the waste stream for a long period. In the frame of an extended research program dealing with the utilization of thermoplastic waste, the effect on the reinforcement corrosion of concretes containing the above polymers as aggregates has been studied. As the amount of aggregates required in concrete is large, the environmental benefits are not only related to the safe disposal of the waste, but also to the environmental impacts arising from the extraction of aggregates, which include the visual intrusion and the loss of countryside. Three series of reinforced concrete specimens were prepared, one containing 12% by volume of aggregates high density polyethylene (HDPE), one containing 12% by volume of aggregates polypropylene (PP) and one without replacement of conventional aggregates. The specimens were cured in water for 7 days and then they were immersed in 3.5%wt NaCl solution. The following measurements were carried out in order to investigate if the corrosion behavior of the rebars is changed due to the replacement of the conventional aggregates by the thermoplastics: Potential versus time evolution, Linear Polarization, Electrochemical Impedance Spectroscopy, Carbonation Depth. Results showed that the replacement of conventional aggregates by the two polymers studied does not provoke rebars' corrosion.

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“…[2]. The widest use of fly ash is in the production of cement because it exhibits pozzolanic properties [3,4]. Most international and domestic research is based on the use of fly ash as a substitute for cement in concrete production [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Physicomechanical properties of fly ash applicable in road construction

2017

JCE

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Physico-mechanical properties of fly ash applicable in road constructionAn experimental research of physico-mechanical properties of fly ash and ash stabilized with lime and cement, as used in road construction, is presented in the paper. The binder was added in the proportion of 2, 4 and 6 % of the total quantity of fly ash. The testing revealed that ash samples with and without binder can be used for improvement of foundation soil and for construction of embankments and subgrade layers, but are not recommended for construction of subbase and base courses. The research is based on the use of fly ash for road construction, i.e. as a substitute for natural materials in construction industry, as this use would save natural resources whose reserves are limited. Fizikalno-mehanička svojstva letećeg pepela primjenjivog pri građenju cesta U radu je prikazano eksperimentalno istraživanje fizikalno-mehaničkih svojstava letećeg pepela i stabiliziranog pepela s dodatkom vapna i cementa primjenjivog za gradnju cesta. Vezivo je dodavano sa 2, 4 i 6 % u odnosu na ukupnu količinu letećeg pepela. Nakon izvršenih ispitivanja uočljivo je da uzorci pepela bez dodataka i s dodatkom veziva mogu koristiti za izradu temeljnog tla, nasipa i posteljice, dok za izradu nosivih slojeva nisu preporučljivi. Istraživanje se temelji na korištenju letećeg pepela za izgradnju cesta, odnosno kao zamjena prirodnim materijalima u građevinarstvu, pri čemu se štede prirodni resursi čije su rezerve ograničene.

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The anticorrosive effect of fly ash, slag and a Greek pozzolan in reinforced concrete

Cited by 39 publications

References 5 publications

Exploitation of the solid waste of porfiritis in pozzolanic cements

Exploitation of the solid waste of porfiritis in pozzolanic cements

Concrete containing thermoplastic waste as aggregates – the effect on the rebars’ corrosion

Physicomechanical properties of fly ash applicable in road construction

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